Malicious PDF — malware analysis report

Static analysis result for SHA-256 8146b475383cb19a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d723876ed417810d3b23952bc948113b SHA-1: 6b8187baf924c064bfa67fe1831d90a9dbf2d0da SHA-256: 8146b475383cb19a08bdd64508989be963897920cedc1f197df7ad554c821585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.tocbirsen.org.tr/ckfinder/userfiles/files/14471979706.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ktp56pocv1vr0ve3q2qdmue916/14202908145.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/62518518482.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/momotajadefofapuxo.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/b8gqcp3lo5ccndp32ghl8g79u2/bexemokofixodefewixugete.pdfIn PDF document text
    • http://cycling-software.com/files/file/bobodelanofarew.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/9714626597.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/71546826782.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kukojovetov.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f057c36f25---42701694137.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/134427244.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-25/images/files/79858068925.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/66a50969257ad45e31d8be1c3fb68b53/xujuragurogarujefewep.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/70566292751.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7c50c8597---96698240003.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/92987294147.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c7a8b0044---voxiloxezutopibawe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609138a4460a4---tadomof.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9ab0df6gm7h4sj2ho84k22678t/85434607791.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/kuzeposexafupirivanuti.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3933c30f63---52189519475.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/nedekalanexonaj.pdfIn PDF document text
    • http://grupophi.es/uploads/files/tubogaxuwugixinul.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bc861b44---sorividemanexerulizupuka.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42347888231.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609901e7d92bc---sodemevobuvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=geography+notes+pdf+for+upscPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6cad9f2109f98ffbb5ebc80b6ba11151/86684218773.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 11016 bytes
SHA-256: 939b07a71d48c84d3262df6c8894e204ddf1c1e1f7f58a8e32ad245065e27713
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 17632 bytes
SHA-256: 0533d0023a1d7e111a8f22c3755301f84a3500959e0a05d3a071be3c43775294

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